---
title: "300 Six — Ford F100 Glossary | fordf100s.com"
description: "Ford's 300 cubic inch inline-six, built from 1965 to 1996 and known for durability, torque, and decades of F-Series truck service."
canonical_url: "https://www.fordf100s.com/glossary/300-six/"
last_updated: "2026-09-16"
---

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Glossary Term

#  300 Six — Ford F100 Glossary 

Ford's 300 cubic inch inline-six, built from 1965 to 1996 and known for durability, torque, and decades of F-Series truck service.

fordf100s.com · Updated September 16, 2026 

Definition

Ford's 300 cubic inch inline-six engine (1965-1996), renowned for extreme durability and longevity as the base F-Series engine for over three decades.

The Ford 300 cubic inch inline-six is one of the most durable truck engines ever produced. Built from 1965 through 1996, it served as the base engine in F-Series trucks for over thirty years. In F-100s, it was available from the fifth generation (1967-1972) through the end of the F-100 line in 1983, and it continued in F-150s long after.

What makes the 300 Six legendary is its low-end torque and near-indestructible reliability. With a long stroke and conservative tuning, these engines routinely exceed 300,000 miles with basic maintenance. The design is intentionally understressed, favoring longevity over peak power output.

For F-100 owners, the 300 Six is a practical choice that keeps fuel costs down and maintenance simple. It lacks the excitement of a V8 but compensates with dependability. Many work trucks ran these engines for decades without major repair. Parts are cheap and universally available. If you find an F-100 with a running 300 Six, the engine is likely the least of your concerns during a restoration. It is the definition of a bulletproof truck powerplant.

Related Terms

[ Windsor ](/glossary/windsor/)[ Y-Block ](/glossary/y-block/) 

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